TABLE 3.

Multivariate model of factors predicting mastectomy

	OR	p value	95 % CI
Subtype
HER2-positive/HR-positive	1.31	<0.001	1.24–1.38
HER2-positive/HR-negative	1.73	<0.001	1.60–1.87
HER2-negative/HR-positive	Ref
TNBC	1.05	0.057	1.00–1.10
Age (years)
<40	2.37	<0.001	2.19–2.56
40–49	1.38	<0.001	1.32–1.45
50–59	Ref
60–69	0.83	<0.001	0.79–0.87
70–79	0.86	<0.001	0.82–0.91
≥80	0.93	0.034	0.88–0.99
Stage
I	Ref
II	2.31	<0.001	2.24–2.39
III	8.17	<0.001	7.73–8.63
Marital status
Married	Ref
Single	0.94	0.005	0.89–0.98
Separated	1.02	0.259	0.98–1.06
Race
White	Ref
Black	0.91	0.001	0.87–0.96
Other	1.18	<0.001	1.12–1.25
Hispanic
No	Ref
Yes	1.05	0.072	1.00–1.11
Year of diagnosis
2010	Ref
2011	0.96	0.012	0.93–0.99

OR odds ratio, CI confidence interval, HER2 human epidermal growth factor receptor-2, HR hormone receptor, TNBC triple-negative breast cancer